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Document newly added tunables.

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hw.re.intr_filter
 hw.re.msix_disable
 dev.re.%d.int_rx_mod
This commit is contained in:
Pyun YongHyeon 2011-01-26 21:59:59 +00:00
parent f8cdf87663
commit da65f7d0fe
1 changed files with 25 additions and 1 deletions
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@ -30,7 +30,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd January 15, 2011
.Dd January 26, 2011
.Dt RE 4
.Os
.Sh NAME
@ -175,15 +175,39 @@ Tunables can be set at the
prompt before booting the kernel or stored in
.Xr loader.conf 5 .
.Bl -tag -width "xxxxxx"
.It Va hw.re.intr_filter
This tunable makes driver use interrupt filter handler on
controllers that support MSI/MSI-X capability.
If MSI/MSI-X is disabled by administrator this tunable has no
effect and driver will use interrupt filter handler.
The default value is 0 to use interrupt thread handler.
.It Va hw.re.msi_disable
This tunable disables MSI support on the Ethernet hardware.
The default value is 0.
.It Va hw.re.msix_disable
This tunable disables MSI-X support on the Ethernet hardware.
The default value is 0.
.It Va hw.re.prefer_iomap
This tunable controls which register mapping should be used on the
specified device.
A non-zero value enables I/O space register mapping.
The default value is 0 to use memory space register mapping.
.El
.Sh SYSCTL VARIABLES
The following variables are available as both
.Xr sysctl 8
variables and
.Xr loader 8
tunables:
.Bl -tag -width "xxxxxx"
.It Va dev.re.%d.int_rx_mod
Maximum amount of time to delay receive interrupt processing in
units of 1us.
The accepted range is 0 to 65, the default is 65(65us).
Value 0 completely disables the interrupt moderation.
The interface need to be brought down and up again before a change
takes effect.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "re%d: couldn't map memory"